FROG DISSECTION. B. Identify in each of your sketches were applicable the following structures: i. eyes. vi. hindlimbs ii.
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1 FROG DISSECTION Groups of 3 Choose your partners carefully as each person in the group will be accountable. Follow directions diligently and exercise safety precautions and common sense. If you are unsure about anything, stop, reflect and if need be, ask the teacher. PART 1: EXTERNAL STRUCTURES Rinse your specimen in water and place it on the dissection tray A. Make a scientific drawing of the frog: i. a dorsal view ii. a ventral view ii. a side view B. Identify in each of your sketches were applicable the following structures: i. eyes vi. hindlimbs ii. external nares vii. anus (cloaca) iii. tympanum viii. the skin iv. nictitating membrane ix. teeth v. forelimbs 1. What is the purpose of the nares? 2. What is the purpose of the tympanum? 3. What is the purpose of the nictitating membrane? 4. What is the major difference between the ventral side and the dorsal side? 5. What are some differences between the types of limbs? 6. What is the purpose of the teeth? 7. What is the sex of your frog? (you may have to look at several frogs to identify some features about your frog) C. Examine the skin. Describe some of the features of the skin. 8. What is one function of the skin? (can you provide other functions of the skin?)
2 D. Open your frog s mouth. You may need to make small cuts at the hinges to open it wider Identify as many parts in Figure 1 as you can. Figure 1 Structure in the Frog s Mouth
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4 FROG DISSECTION Groups of 3 Choose your partners carefully as each person in the group will be accountable. Follow directions diligently and exercise safety precautions and common sense. If you are unsure about anything, stop, reflect and if need be, ask the teacher. PART 2: INTERNAL STRUCTURES A. Write your procedure to make the cuts to open the frog. (your teacher must approve your procedure before taking the next step) B. Make the cuts. i. Examine the inside of the frog noting the structures that are visible. Use the images on the SmartBoard to help you identify those structures. 9. What structures do you see and what systems are they a part of? Group the structures into the different systems. ii. Carefully lift the liver. 10. Describe what you see below the liver. C. Removing organs. i. Using a probe and scissors, lift and remove the liver. Place the liver to the side. ii. Remove any fat bodies and place them to the side. iii. Remove the stomach and place it aside. Make a scientific drawing of the external structure of the stomach. iv. Carefully open the stomach lengthwise and open it up. 11. Describe what you see in the stomach. 12. After removing fat bodies, the liver and the stomach, are there new structures visible. Identify any new organs now visible and state what system they belong to. v. Remove the heart (keeping arteries attached) and place it aside. Make a scientific drawing of the heart and label the parts.
5 vi. Carefully dissect the heart. Make a scientific drawing of the interior of the heart and label the parts vii. Remove the lungs and place it aside. Get an eyedropper and try to inflate the lung. 13. Describe what happens to the lungs. viii. Examine the small and large intestine 14. Describe the location, shape and structure of the small and large intestine. ix. Locate the reproductive organs of your frog. Describe the types of organs that are present and confirm the sex of your frog. 15. How do you identify the sex of a frog externally and internally. D. Carefully remove other organs and place them aside and identify them. Using the organs that you put aside, reconnect next to your frog the organs back into organ systems. Make a scientific drawing of your different organ systems, labeling the parts. E. Clean up and return all components to where you got them. Dispose of frog as directed by your teacher.
6 ANALYSYS QUESTIONS 1. Where is the liver located when you open up the frog? What is the purpose of the liver? 2. What is the purpose of the gallbladder? 3. Where is the stomach located? What shape is the stomach? What goes on in the stomach? 4. What does fat look like? What are the purposes of fat in the frog? 5. In what type of frogs are oviducts found? 6. Where is the kidney located? What is the purpose of the kidney? 7. Where is the heart located in the frog? What is the purpose of the heart? 8. How many chambers in the frog heart? How does that differ from a human heart? 9. How do a frog s lungs work? How are they similar and different from human lungs? 10. How are the small and large intestines connected to each other and to the stomach and cloaca.
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